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As an update, did the drain and refill using the Febi/Bilstein 34608 ATF (used a little over 5 quarts). Has been working great with no issues. Based on spec sheets (see attached), the BMW ZF 6 speed transmission utilizes Shell M-1375.4 fluid (see pages 6 and page 7 for E70 cars with I6 and V8 engines).
In the same note, so long as the fluid meets and is certified for the specification, it should be fine. Otherwise, I would imagine you would ONLY use genuine BMW fluids--genuine BMW engine oil, genuine BMW DOT4 brake fluid, genuine BMW rear differential fluid, genuine BMW BlueDef (if you have a diesel), and dare I say genuine BMW washer fluid? A bit overkill. If the fluid didn't meet specification, that's a different story. Of note, I stuck with genuine BMW transfer case fluid as there's no substitute, given there is no listed/known specification for it. Of course, everyone is welcome to use what they are comfortable with paying.
Last edited by X5Boise; 06-21-2016 at 12:59 AM.
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